Not only does an infant receive DNA from father and mother--through the placenta, mothers receive the infant's DNA back--it is said a mother has the DNA of her children her entire life. That's a very close relationship. Siblings also receive DNA through the placenta from their mom that includes previous siblings' DNA. DNA is in breastmilk, too. That's the 'nature' of 'nature and nurture.' Then we have the lifelong nurture of care, devotion, interest, being the backup. Being a mom is pretty intense. But once you are a mom, your previous life seems dim, far away. The future always includes your babies. Even if your babies are grown and have babies. It is amazing.
Happy Mother's Day.